It only just occurred to me seeing the strip now that Mike is sticking his finger down his throat and the whole narrative makes much more sense. Whenever I read it originally years back for some reason I thought he was eating his fist out of some sense of intense frustration.

Yes, because then she’d be consistently evil and probably aware of the fact. Right now she’s willing to utterly violate Mike’s will, destroying his personality to make him behave in a way he’d find reprehensible, and likely causing him long-term medical issues in the process. But she’s not going to do anything physical with him, and so she can remain convinced she’s a good person. It also raises the question of what other moral loopholes she’ll find for herself as-needed later.

I can’t really take this seriously as a morally wrong thing. If Mike in this world is some kind of force of nature who gets away with his shit because regular moral laws don’t apply to him, then those moral rules don’t apply the other way either.